Boston Meeting of the Geological Society. 209 
•and abounds in fossil plants. Its easternmost outcrop is in the south- 
west edge of Arkansas, near the Choctaw line. The two chalk beds of 
the Upper Cretaceous, presenting a singular coincidence with the Up- 
per and Lower Chalk of Europe, occur in northeastern Texas and 
southwestern Arkansas. The glauconitic division, synchronous with 
the Montana, but of the New Jersey facies, was shown to be well devel- 
oped in northeastern Texas, occurring there and in Arkansas mostly as 
inliers in the Eocene area, being exposed by erosion. The Neocene and 
Pleistocene history of the region shows that it has been the scene of 
similar events to those of the Potomac estuary. 
A fauna was announced as occurring in the Shoal Creek limestone of 
Austin, which is entirely unique and new to our knowledge of the Cre- 
taceous. The brachiopods of the Comanche, upon the authority of 
•Schuchert, were referred to the genus Kingena, which had not been 
hitherto reported in this country. The differentiation and variation of 
the formations away from this region were discussed at length. The 
old historic localities were described, and the speaker stated that Mr. 
Jules Marcou's descriptions of the fossils from Preston and Fort 
Washita contained the first announcement of the Lower Cretaceous 
age of beds that constitute a part of the Comanche series. 
28. Notes on the Geology of Lower California. S. F. Emmons and 
<3. P. Merrill, both of Washington, D. C. (Read by title.) So little 
is actually known with regard to the geology of the peninsula of Low- 
er California that the writers feel justified in putting on record the 
somewhat incomplete data gathered by them in the years 1892 and 1893 
with regard to a belt of country some GO miles in width extending 
nearly across the peninsula near the 30th parallel of latitude. 
Prof. Gabb in 1867 made a reconnoissance trip from the southern end 
•of the peninsula to San Diego, and as a result of his observations 
divided the peninsula into three topographical provinces: (1) a moun- 
tainous portion in the extreme south, consisting of irregular ranges of 
granitic rocks with a maximum elevation of about 5,000 feet; (2) an 
intermediate mesa region, with an average elevation of not over 3,000 
to 4,000 feet, comprising the greater portion of the peninsula; and (3) 
a northern mountainous portion, with a longitudinal mountain chain 
filling the greater part of the width of the peninsula and extending 
across the boundary into southern California. The older horizontal 
beds forming the mesa region he considered as probably of Mio- 
cene age, and he recognized Pliocene and post-Pliocene beds resting 
upon their eroded edges. 
W. Lindgren in 1888 examined the northern mountainous portion of 
the peninsula in the latitude of Todos Santos bay, about 60 miles south 
of the international boundary. He was struck with its resemblance in 
orographic structure and in the character of its constituent rocks with 
the Sierra Nevada, and found that the beds from which fossils of the 
Chico Cretaceous had been already obtained at Todos Santos bay are 
a small patch of nearly horizontal sandstones which have been pro- 
tected from marine degradation by a projecting point of older eruptive 
rocks. With regard to the latter beds he conjectured that they must 
be more fully developed further south and that the mesa sandstones, 
doubtfully assigned by Gabb to the Miocene, would prove on investi- 
gation to be Cretaceous. 
The observations on which the present paper is based, show that the 
lower beds of the mesa region on the immediate western coast between 
the 29th and 30th parallels consist of Chico Cretaceous overlaid by 
Tejon Eocene, both horizons being defined by characteristic fossils. 
These beds are practically undisturbed and show no evidence of any ex- 
tensive orographic movements. 
Further north are more recent beds, occupying similar positions 
along the coast, from which no characteristic fossils were obtained, but 
